C. Mendez-Guerra, A. Al-Kassab-Córdova, G. Cornejo-Venegas, A. Quevedo-Ramirez, K. Alva, and E. Napanga-Saldaña, “Factors associated with unwanted additional fertility: secondary analysis of a national survey in Peru”, Rev Peru Med Exp Salud Publica, vol. 37, no. 4, pp. 645–53, Nov. 2020, doi: 10.17843/rpmesp.2020.374.5705.